Add example for Streamlit app that uses PostgreSQL

[stanleyo03]

Link to app on Ploomber Cloud: https://twilight-fog-4463.ploomberapp.io/

Closes #258

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📚 Documentation preview 📚: https://ploomber-doc--262.org.readthedocs.build/en/262/

[bryannho]

Basic function works well - one question.

When I enter a new data point in, I notice that I have to change one of the axes for the new point to be loaded on the chart and table (I assume because the frontend doesn't grab the new data until an axis is changed). This might be confusing since users expect to see it immediately without doing anything.

Can you add an automatic reload? You could have it reload after a delay (the postgres query should go through pretty fast) or worst case, add a refresh button to show the changes without changing any axes.

[neelasha23]

This is not restarting for some reason:

Can u please start the app and lmk @stanleyo03

[bryannho]

This is not restarting for some reason:

Can u please start the app and lmk @stanleyo03

This is a bug on the backend. @stanleyo03 you probably need to delete this one and re deploy it as a new app

[stanleyo03]

@bryannho @neelasha23 Here is a new link: https://twilight-fog-4463.ploomberapp.io/

[bryannho]

App looks good with the reload! One minor comment

[neelasha23]

In the left sidebar, please add a very brief description of the utility of the app and what happens when a user inputs a new point (what changes should they expect to see) @stanleyo03

[stanleyo03]

@bryannho @neelasha23 should be ready for merge